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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e110034e801976fb55dc4eabe3cf3b2b7b7830bd04c9ef449b5e06b955c494c4' 
  AND token = 'Mt6NL9q26jTRAbSvKacdZgVW0TIPFK31gWbOwTBcv30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}